An educational psychologist investigated the impact of a newly introduced county-wide school ban on smartphones on student anxiety levels. The psychologist compared anxiety scores from pupils in the county with the ban to pupils in a neighbouring county where no such ban was introduced.
Explain one strength and one weakness of using a natural experiment for this research.
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.